PeerTube/server/models/video/video-streaming-playlist.ts

import { AllowNull, BelongsTo, Column, CreatedAt, DataType, ForeignKey, HasMany, Is, Model, Table, UpdatedAt } from 'sequelize-typescript'
import { isVideoFileInfoHashValid } from '../../helpers/custom-validators/videos'
import { throwIfNotValid } from '../utils'
import { VideoModel } from './video'
import * as Sequelize from 'sequelize'
import { VideoRedundancyModel } from '../redundancy/video-redundancy'
import { VideoStreamingPlaylistType } from '../../../shared/models/videos/video-streaming-playlist.type'
import { isActivityPubUrlValid } from '../../helpers/custom-validators/activitypub/misc'
import { CONSTRAINTS_FIELDS, STATIC_PATHS } from '../../initializers'
import { VideoFileModel } from './video-file'
import { join } from 'path'
import { sha1 } from '../../helpers/core-utils'
import { isArrayOf } from '../../helpers/custom-validators/misc'

@Table({
  tableName: 'videoStreamingPlaylist',
  indexes: [
    {
      fields: [ 'videoId' ]
    },
    {
      fields: [ 'videoId', 'type' ],
      unique: true
    },
    {
      fields: [ 'p2pMediaLoaderInfohashes' ],
      using: 'gin'
    }
  ]
})
export class VideoStreamingPlaylistModel extends Model<VideoStreamingPlaylistModel> {
  @CreatedAt
  createdAt: Date

  @UpdatedAt
  updatedAt: Date

  @AllowNull(false)
  @Column
  type: VideoStreamingPlaylistType

  @AllowNull(false)
  @Is('PlaylistUrl', value => throwIfNotValid(value, isActivityPubUrlValid, 'playlist url'))
  @Column(DataType.STRING(CONSTRAINTS_FIELDS.VIDEOS.URL.max))
  playlistUrl: string

  @AllowNull(false)
  @Is('VideoStreamingPlaylistInfoHashes', value => throwIfNotValid(value, v => isArrayOf(v, isVideoFileInfoHashValid), 'info hashes'))
  @Column(DataType.ARRAY(DataType.STRING))
  p2pMediaLoaderInfohashes: string[]

  @AllowNull(false)
  @Is('VideoStreamingSegmentsSha256Url', value => throwIfNotValid(value, isActivityPubUrlValid, 'segments sha256 url'))
  @Column
  segmentsSha256Url: string

  @ForeignKey(() => VideoModel)
  @Column
  videoId: number

  @BelongsTo(() => VideoModel, {
    foreignKey: {
      allowNull: false
    },
    onDelete: 'CASCADE'
  })
  Video: VideoModel

  @HasMany(() => VideoRedundancyModel, {
    foreignKey: {
      allowNull: false
    },
    onDelete: 'CASCADE',
    hooks: true
  })
  RedundancyVideos: VideoRedundancyModel[]

  static doesInfohashExist (infoHash: string) {
    const query = 'SELECT 1 FROM "videoStreamingPlaylist" WHERE $infoHash = ANY("p2pMediaLoaderInfohashes") LIMIT 1'
    const options = {
      type: Sequelize.QueryTypes.SELECT,
      bind: { infoHash },
      raw: true
    }

    return VideoModel.sequelize.query(query, options)
              .then(results => {
                return results.length === 1
              })
  }

  static buildP2PMediaLoaderInfoHashes (playlistUrl: string, videoFiles: VideoFileModel[]) {
    const hashes: string[] = []

    // https://github.com/Novage/p2p-media-loader/blob/master/p2p-media-loader-core/lib/p2p-media-manager.ts#L97
    for (let i = 0; i < videoFiles.length; i++) {
      hashes.push(sha1(`1${playlistUrl}+V${i}`))
    }

    return hashes
  }

  static loadWithVideo (id: number) {
    const options = {
      include: [
        {
          model: VideoModel.unscoped(),
          required: true
        }
      ]
    }

    return VideoStreamingPlaylistModel.findByPk(id, options)
  }

  static getHlsPlaylistFilename (resolution: number) {
    return resolution + '.m3u8'
  }

  static getMasterHlsPlaylistFilename () {
    return 'master.m3u8'
  }

  static getHlsSha256SegmentsFilename () {
    return 'segments-sha256.json'
  }

  static getHlsVideoName (uuid: string, resolution: number) {
    return `${uuid}-${resolution}-fragmented.mp4`
  }

  static getHlsMasterPlaylistStaticPath (videoUUID: string) {
    return join(STATIC_PATHS.STREAMING_PLAYLISTS.HLS, videoUUID, VideoStreamingPlaylistModel.getMasterHlsPlaylistFilename())
  }

  static getHlsPlaylistStaticPath (videoUUID: string, resolution: number) {
    return join(STATIC_PATHS.STREAMING_PLAYLISTS.HLS, videoUUID, VideoStreamingPlaylistModel.getHlsPlaylistFilename(resolution))
  }

  static getHlsSha256SegmentsStaticPath (videoUUID: string) {
    return join(STATIC_PATHS.STREAMING_PLAYLISTS.HLS, videoUUID, VideoStreamingPlaylistModel.getHlsSha256SegmentsFilename())
  }

  getStringType () {
    if (this.type === VideoStreamingPlaylistType.HLS) return 'hls'

    return 'unknown'
  }

  getVideoRedundancyUrl (baseUrlHttp: string) {
    return baseUrlHttp + STATIC_PATHS.REDUNDANCY + this.getStringType() + '/' + this.Video.uuid
  }

  hasSameUniqueKeysThan (other: VideoStreamingPlaylistModel) {
    return this.type === other.type &&
      this.videoId === other.videoId
  }
}